| Gapontsev Valentin P +4 co-filersCEO & Chairman of the Board, Director, 10% owner, 10% owner, Director, 10% owner, Managing Director of IPG Laser, 10% owner · 6 transactions | — | 9.21M†as of Dec 2011 | — | — | 200.0K |
| Platonov Nikolai +2 co-filers10% owner, Director, 10% owner, Managing Director of IPG Laser, 10% owner · 3 transactions | — | 7.93Mas of Dec 2011 | — | — | 70.0K |
| Valentin Gapontsev Trust I10% owner · 210 transactions | — | 6.73M | — | — | 1.20M |
| Ip Fibre Devices LTD10% owner · 125 transactions | — | 6.53M | — | — | 1.52M |
| Ta Associates IncDirector · 21 transactions | — | 3.21Mas of Jul 2007 | — | — | 611.5K |
| Ta Associates IX LLCDirector · 21 transactions | — | 1.65Mas of Jul 2007 | — | — | 314.3K |
| Ta IX LPDirector · 21 transactions | — | 1.65Mas of Jul 2007 | — | — | 314.3K |
| Pavlova Natalia +1 co-filerDirector, SVP, Chief Scientist · 29 transactions | — | 1.56M† | 39.7K | — | 8.5K |
| Ta / Atlantic & Pacific IV LP +8 co-filersSee General Remarks · 465 transactions | — | 1.22M†as of Sep 2008 | — | — | 3.20M |
| Gapontsev DenisVice President · 16 transactions | — | 1.04Mas of Nov 2008 | — | — | 80.0K |
| Samartsev IgorSVP, Chief Technology Officer, Director · 116 transactions | — | 933.0K†as of Jun 2021 | 229.6K | — | 157.0K |
| Ta Advent VIII LPDirector · 21 transactions | — | 769.4Kas of Jul 2007 | — | — | 146.8K |
| Ta Associates VIII LLCDirector · 21 transactions | — | 769.4Kas of Jul 2007 | — | — | 146.8K |
| Ta / Atlantic & Pacific IV LPDirector · 21 transactions | — | 712.5Kas of Jul 2007 | — | — | 135.9K |
| Ta Associates Ap IV LPDirector · 21 transactions | — | 712.5Kas of Jul 2007 | — | — | 135.9K |
| Gapontsev Valentin PCEO & Chairman of the Board, Director, 10% owner · 125 transactions | — | 298.6Kas of Nov 2020 | — | — | 14.75M |
| Gitin Mark MiltonCEO, Director · 6 transactions | — | 87.2K | 103.8K | — | — |
| Mammen Timothy PVSVP, Chief Financial Officer · 216 transactions | — | 76.4K | 549.2K | 3.0K | 523.2K |
| Ovtchinnikov AlexanderSVP, Chief Technology Officer, 10% owner · 177 transactions | — | 76.1Kas of Mar 2024 | 342.9K | — | 334.7K |
| Shcherbakov Eugene ADirector, 10% owner · 207 transactions | — | 73.4Kas of May 2025 | 343.8K | — | 456.4K |
| Child Michael CDirector · 45 transactions | — | 68.6Kas of Jun 2024 | 168.2K | 89 | 100.6K |
| Lopresti Angelo PSVP, Secretary & Gen Counsel, 10% owner · 208 transactions | — | 60.8K | 461.2K | — | 465.1K |
| BuAbbud George HVice-President, Telecom · 54 transactions | — | 56.8Kas of Feb 2013 | 283.0K | — | 223.5K |
| Scherbakov Eugene ADirector, 10% owner · 18 transactions | — | 51.3K | 7.6K | — | 16.2K |
| Ta Investors LLCDirector · 21 transactions | — | 48.3Kas of Jul 2007 | — | — | 9.2K |
| Dalton John HDirector · 80 transactions | — | 39.6Kas of Mar 2011 | 2.0K | — | 287.3K |
| Ness TrevorSVP, Chief Revenue Officer · 141 transactions | — | 38.4K | 150.5K | — | 85.0K |
| Stukalin Felix ISVP, Chief Operating Officer, Director · 35 transactions | — | 37.9Kas of Mar 2023 | 44.8K | — | 20.1K |
| Ta Executives Fund LLCDirector · 21 transactions | — | 27.8Kas of Jul 2007 | — | — | 5.3K |
| Meurice EricDirector · 59 transactions | — | 25.2K | 38.3K | — | 12.4K |
| Shiner William HVP, Industrial Products · 170 transactions | — | 24.8Kas of Dec 2012 | 171.7K | — | 143.5K |
| Blair Robert ADirector · 177 transactions | — | 24.7Kas of May 2015 | 74.4K | — | 415.6K |
| Peeler John RDirector · 47 transactions | — | 20.9K | 65.1K | 2.7K | 28.7K |
| Krupke William FDirector · 31 transactions | — | 19.5Kas of Feb 2014 | 35.1K | — | 130.6K |
| Lego Catherine PDirector · 9 transactions | — | 19.3Kas of Nov 2020 | 16.3K | 3.0K | 8.5K |
| Dougherty GregDirector · 9 transactions | — | 18.3K | 18.3K | — | — |
| Gauthier Henry EDirector · 45 transactions | — | 17.1Kas of May 2019 | 97.0K | — | 65.0K |
| Hurley William SDirector · 38 transactions | — | 16.3Kas of May 2018 | 84.5K | 8.0K | 71.6K |
| Beecher Gregory RDirector · 5 transactions | — | 12.2K | 12.2K | — | — |
| Burgomaster Thomas JChief Accounting Officer · 112 transactions | — | 11.6Kas of Mar 2025 | 72.1K | — | 61.1K |
| Kennedy Kolleen TDirector · 4 transactions | — | 11.5K | 11.5K | — | — |
| Desmond Jeanmarie F.Director · 12 transactions | — | 10.5K | 15.7K | — | 5.2K |
| Agnes TangDirector · 12 transactions | — | 10.3K | 13.9K | — | 4.3K |
| Seifert Thomas JDirector · 23 transactions | — | 8.9Kas of May 2022 | 33.3K | — | 19.2K |
| Bucher PaulusSVP, Global Operations · 2 transactions | — | 6.7K | 6.7K | — | — |
| Buttarazzi Mary E.VP, Corp Controller and CAO · 3 transactions | — | 4.7K | 1.8K | — | 500 |
| Kampfe Michael RDirector · 1 transaction | — | 1.0Kas of Jun 2012 | 1.0K | — | — |